List::Compare::Lite - Compare the elements of two lists
version 0.02
use List::Compare::Lite ':all';
my @list_a = ( qw{ a b c 3 4 5 } );
my @list_b = ( qw{ c d e 1 2 3 } );
my $intersection = intersection ( \@list_a, \@list_b );
my $difference = difference ( \@list_a, \@list_b );
my $union = union ( \@list_a, \@list_b );
# or...
my ( $intersection, $difference, $union )
= compare( \@list_a, \@list_b );
# $intersection ~~ [ qw{ 3 c } ]
# $difference ~~ [ qw{ e a d 2 1 4 b 5 } ]
# $union ~~ [ qw{ e a 3 d 2 1 4 c b 5 } ]
For the given two lists, calculate:
the intersection (which elements appear in both given arrays) the (symmetric) difference (which elements appear in both given arrays, but not in both) the union (which elements appear in both given arrays)
my $intersection = intersection( \@array_1 \@array_2 );
Return an array reference to a list of items that appear one or more times in both lists (their intersection).
my $difference = difference( \@array_1 \@array_2 );
Returns an array reference to a list of items that appear one or more times in either the first or the second list, but not in both (their symmetric difference).
my $union = union( \@array_1 \@array_2 );
Returns an array reference to a list of items that appear one or more times in either list (their union).
Nothing by default. To import all of this module's symbols, do the conventional
use List::Compare::Lite ':all';
It may make more sense though to only import the stuff your program actually needs:
use List::Compare::Lite qw{ difference };
This module is completely based of the code found in perlfaq4, so all credit must go to the author of that document.
List::Compare is a more comprehensive and object-orientated module which provided the inspiration for the naming of this module.
Peter Hallam [email protected]
This software is copyright (c) 2012 by Peter Hallam.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
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